Waist-twisting exercise device



FIG. 1 is a perspective view of a waist-twisting exercise device showingour new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view of the waist-twisting exercise device,wherein the broken line showing of the person is for illustrativepurposes only and forms no part of the claimed design.

The ornamental design for a waist-twisting exercise device, as shown anddescribed.